Portable test instrument



FIG. 1 is an oblique view of a first variant of the portable test instrument, showing my new design;

FIG. 2 is a front elevation view thereof,

FIG. 3 is a right side elevation view thereof,

FIG. 4 is a left side elevation view thereof,

FIG. 5 is a top plan view thereof,

FIG. 6 is a rear elevation view thereof,

FIG. 7 is a bottom plan view thereof,

FIG. 8 is an oblique view of a second variant of the portable test instrument, showing my new design;

FIG. 9 is a front elevation view thereof,

FIG. 10 is a right side elevation view thereof,

FIG. 11 is a left side elevation view thereof,

FIG. 12 is a top plan view thereof,

FIG. 13 is a rear elevation view thereof; and,

FIG. 14 is a bottom plan view thereof.

The lightweight broken line portions are included to show environmental unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a portable test instrument, as shown and described. 